package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.*;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.RedisConstants.USER_SIGN_KEY;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合,返回错误信息
            return Result.fail("手机号格式错误!");
        }
        //3.符合,生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到session
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送验证码成功,验证码: {}", code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        //2.从redis获取验证码,校验验证码
        Object cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        //3.不一致,报错
        if (cacheCode == null || !cacheCode.toString().equals(code)) {
            return Result.fail("验证码错误");
        }
        //4.一致,根据手机号查询用户 select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if (user == null) {
            //6.不存在,创建新用户并保存
            user = createUserWithPhone(phone);
        }

        //7.保存用户信息到session中
        //生成一个token作为登录令牌,将User对象转为HashMap存储,存储
        String token = UUID.randomUUID().toString();
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        //设置有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //8.返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1.获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);

        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截至今天所有的签到记录,返回的是一个十进制数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.size() == 0) {
            //没有签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            //未签到
            return Result.ok(0);
        }
        int count = 0;
        //6.循环遍历
        while (true) {
            //6.1.让这个数字与1做与运算,得到数字的最后一个bit位
            if ((num % 1) == 0) {
                //6.3.如果为0，说明未签到，结束
                break;
            } else {
                //6.4.如果为1，说明已签到，计数器+1
                count++;
            }
            //6.5.把数字右移一位,继续判断下一个bit位
            num = num >> 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
